Amazon, Berkshire Hathaway, and JPMorgan Chase & Co. are teaming up on ways to address healthcare for their US-based employees. The companies will aim to improve employee satisfaction while reducing costs, according to a joint press release.

Americans spent an average of $714, or 1.6% of their take-home pay on out-of-pocket healthcare spending in 2016, according to a report from JPMorgan Chase. That's up 3.6% versus a year ago and up 13.5% from 2013...